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Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Share Based Incentive Award Activity
The following table summarizes the activity that occurred during the six months ended June 30, 2017 for each type of share-based incentive award issued by Pioneer:
 
 
Restricted
Stock Equity
Awards
 
Restricted
Stock Liability
Awards
 
Performance
Units
 
Stock
Options
Outstanding as of December 31, 2016
 
1,077,227

 
290,552

 
178,556

 
159,378

Awards granted
 
320,103

 
108,911

 
59,044

 
—

Awards forfeited
 
(13,527
)
 
(5,012
)
 
—

 
—

Awards vested
 
(437,845
)
 
(129,499
)
 
—

 
—

Outstanding as of June 30, 2017
 
945,958

 
264,952

 
237,600

 
159,378